Valganciclovir
is an antiviral medication used to amusement cytomegalovirus infections. As the
L-valyl ester of ganciclovir, it is in fact a prodrug for ganciclovir. After
articulate administration, it is rapidly adapted to ganciclovir by abdominal
and hepatic esterases. After this, it (being an alternation of guanosine) gets
congenital into DNA and appropriately cannot be appropriately apprehend by DNA
polymerase. This after-effects in the abortion of the addendum of viral DNA.
Valganciclovir
is a prodrug of ganciclovir that exists as a admixture of two diastereomers.
After administration, these diastereomers are rapidly adapted to ganciclovir by
hepatic and abdominal esterases. In cytomegalovirus (CMV)-infected cells,
ganciclovir is initially phosphorylated to the monophosphate anatomy by viral
protein kinase, again it is added phosphorylated via cellular kinases to
aftermath the triphosphate form. This triphosphate anatomy is boring
metabolized intracellularly. The phosphorylation is abased aloft the viral
kinase and occurs preferentially in virus-infected cells. The virustatic action
of ganciclovir is due to the inhibition of viral DNA amalgam by ganciclovir
triphosphate. Ganciclovir triphosphate is congenital into the DNA fiber
replacing abounding of the adenosine bases. This after-effects in the blockage
of DNA synthesis, as phosphodiester bridges can best to be built, destabilizing
the strand. Ganciclovir inhibits viral DNA polymerases added finer than it does
cellular polymerase, and alternation addendum resumes if ganciclovir is
removed.